feat: apply review suggestions across files

Closes #1386

tests/e2e/test_mobile_apply_review_suggestion_batch_release.py

@@ -7,7 +7,7 @@ ROOT = Path(__file__).parents[2]
 
 
 @pytest.mark.parametrize("viewport", [(320, 568), (390, 844)])
-def test_mobile_author_stages_and_commits_two_same_file_suggestions_atomically(viewport):
+def test_mobile_author_stages_and_commits_cross_file_suggestions_atomically(viewport):
     playwright = pytest.importorskip("playwright.sync_api")
     html = (ROOT / "frontend" / "index.html").read_text()
     detail = {
@@ -19,14 +19,15 @@ def test_mobile_author_stages_and_commits_two_same_file_suggestions_atomically(v
             "comments": [
                 {"id": 99, "path": "src/api.py", "line": 2, "body": "Use the typed empty result.",
                  "suggestion": {"line": 2, "content": "    return empty_result()"}},
-                {"id": 100, "path": "src/api.py", "line": 3, "body": "Keep the result typed.",
-                 "suggestion": {"line": 3, "content": "    return typed_result()"}},
+                {"id": 100, "path": "tests/test_api.py", "line": 2, "body": "Prove the typed result.",
+                 "suggestion": {"line": 2, "content": "    assert lookup() == empty_result()"}},
             ],
         }],
         "files": [
             {"filename": "src/api.py", "status": "modified", "diff_available": True,
              "diff_lines": ["@@ -2 +2 @@", "+    return None"]},
-
+            {"filename": "tests/test_api.py", "status": "modified", "diff_available": True,
+             "diff_lines": ["@@ -2 +2 @@", "+    assert lookup() is None"]},
         ],
     }
 
@@ -48,10 +49,13 @@ def test_mobile_author_stages_and_commits_two_same_file_suggestions_atomically(v
                 globalThis.batchController = createPullSheet({fetchJson: async (path, options = {}) => {
                     batchCalls.push({path, options});
                     if ((options.method || 'GET') === 'GET') {
-                        return {path:'src/api.py', head_sha:'abc1234', blob_sha:'blob1',
-                            content:'def lookup():\\n    return None\\n    return result\\n'};
+                        if (batchCalls.length === 1) return {path:'src/api.py', head_sha:'abc1234', blob_sha:'blob1',
+                            content:'def lookup():\\n    return None\\n'};
+                        return {path:'tests/test_api.py', head_sha:'abc1234', blob_sha:'blob2',
+                            content:'def test_lookup():\\n    assert lookup() is None\\n'};
                     }
-                    return {path:'src/api.py', suggestion_count:2, previous_head_sha:'abc1234', head_sha:'def5678'};
+                    return {paths:['src/api.py','tests/test_api.py'], suggestion_count:2,
+                        previous_head_sha:'abc1234', head_sha:'def5678'};
                 }});
                 document.querySelector('#pull-sheet').classList.add('open');
                 document.querySelector('#pull-review').open = true;
@@ -78,7 +82,7 @@ def test_mobile_author_stages_and_commits_two_same_file_suggestions_atomically(v
         assert page.locator("#review-pull-feedback-batch").text_content() == "Review fixes (2)"
         page.locator("#review-pull-feedback-batch").click()
         assert page.locator("#pull-feedback-batch-review").is_visible()
-        assert page.locator("#pull-feedback-batch-items li").count() == 1
+        assert page.locator("#pull-feedback-batch-items li").count() == 2
         page.locator("#commit-pull-feedback-batch").click()
         page.wait_for_function("batchCalls.length === 3")
         result = page.evaluate("""() => ({
@@ -102,7 +106,8 @@ def test_mobile_author_stages_and_commits_two_same_file_suggestions_atomically(v
     assert request["options"]["method"] == "POST"
     body = request["options"]["body"]
     assert '"expected_head_sha":"abc1234"' in body
-    assert '"file":{"path":"src/api.py"' in body
+    assert '"files":[{"path":"src/api.py"' in body
+    assert '"path":"tests/test_api.py"' in body
     assert '"suggestion_count":2' in body
     assert 'return empty_result()' in body
-    assert 'return typed_result()' in body
+    assert 'assert lookup() == empty_result()' in body